The Free Energy of Formation (ΔG_f°) Is Defined Analogously to a Heat

Essay

The free energy of formation (ΔG_f°) is defined analogously to a heat of formation: it is the standard free energy for formation of a compound from its elements in their standard states at 298 K. Consider the following reaction and their associated standard free energies of formation (all in kJ mol⁻¹). Although these values are for the gas phase, they give us some idea of what to expect in solution.
MTBE has been an important gasoline additive until it began to be replaced by ethanol in 2002.
Calculate the equilibrium constant for this reaction in the left-to-right direction. Show your work.